text: /**
   * Copyright (c) 2021 OceanBase
   * OceanBase CE is licensed under Mulan PubL v2.
   * You can use this software according to the terms and conditions of the Mulan PubL v2.
   * You may obtain a copy of Mulan PubL v2 at:
   *          http://license.coscl.org.cn/MulanPubL-2.0
   * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
   * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
   * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
   * See the Mulan PubL v2 for more details.
   */
  
  #ifndef _OB_EXPR_NOT_H_
  #define _OB_EXPR_NOT_H_
  
  #include "sql/engine/expr/ob_expr_operator.h"
  
  namespace oceanbase {
  namespace sql {
  class ObExprNot : public ObLogicalExprOperator {
  public:
    explicit ObExprNot(common::ObIAllocator& alloc);
    virtual ~ObExprNot(){};
  
    virtual int calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
    virtual int calc_result1(common::ObObj& result, const common::ObObj& obj, common::ObExprCtx& expr_ctx) const;
  
    virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
    static int eval_not(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
  
  private:
    DISALLOW_COPY_AND_ASSIGN(ObExprNot) const;
  };
  }  // namespace sql
  }  // namespace oceanbase
  #endif /* _OB_EXPR_NOT_H_ */
  